$comment.roleLevel is not a valid reference errors in logs

2008-04-16 23:23:40,012 resin-tcp-connection-j2ee.jira.atlassian.com:8080-37 WARN [velocity] org.apache.velocity.runtime.exception.ReferenceException: reference : template = templates/plugins/issueviews/single-word.vm [line 437,column 91
] : $textutils.htmlEncode($comment.roleLevel) is not a valid reference.
        at org.apache.velocity.runtime.parser.node.ASTReference.render(ASTReference.java:277)
        at org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:55)
        at org.apache.velocity.runtime.parser.node.ASTElseIfStatement.render(ASTElseIfStatement.java:78)
        at org.apache.velocity.runtime.parser.node.ASTIfStatement.render(ASTIfStatement.java:89)
        at org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:55)
        at org.apache.velocity.runtime.directive.Foreach.render(Foreach.java:166)
        at org.apache.velocity.runtime.parser.node.ASTDirective.render(ASTDirective.java:114)
        at org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:55)
        at org.apache.velocity.runtime.parser.node.ASTIfStatement.render(ASTIfStatement.java:70)
        at org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:230)
        at org.apache.velocity.Template.merge(Template.java:256)
        at org.apache.velocity.app.VelocityEngine.mergeTemplate(VelocityEngine.java:450)
        at com.atlassian.velocity.DefaultVelocityManager.getEncodedBody(DefaultVelocityManager.java:76)
        at com.atlassian.velocity.DefaultVelocityManager.getEncodedBody(DefaultVelocityManager.java:60)
        at com.atlassian.velocity.DefaultVelocityManager.getEncodedBody(DefaultVelocityManager.java:55)
        at com.atlassian.jira.plugin.JiraResourcedModuleDescriptor.getHtml(JiraResourcedModuleDescriptor.java:95)
        at com.atlassian.jira.issue.views.AbstractIssueHtmlView.getBody(AbstractIssueHtmlView.java:95)
        at com.atlassian.jira.issue.views.SearchRequestRSSView$1.writeIssue(SearchRequestRSSView.java:75)
        at com.atlassian.jira.issue.views.util.SearchRequestViewBodyWriterUtil$1.writeIssue(SearchRequestViewBodyWriterUtil.java:57)
        at com.atlassian.jira.issue.views.util.IssueWriterHitCollector.collect(IssueWriterHitCollector.java:30)
        at com.atlassian.jira.issue.search.providers.LuceneSearchProvider.searchAndSort(LuceneSearchProvider.java:128)
        at com.atlassian.jira.issue.views.util.SearchRequestViewBodyWriterUtil.writeBody(SearchRequestViewBodyWriterUtil.java:61)
        at com.atlassian.jira.issue.views.SearchRequestRSSView.writeSearchResults(SearchRequestRSSView.java:85)
        at com.atlassian.jira.plugin.searchrequestview.SearchRequestURLHandler.handleRequest(SearchRequestURLHandler.java:244)
        at com.atlassian.jira.web.servlet.SearchRequestViewServlet.doGet(SearchRequestViewServlet.java:27)